AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Control brushless motor arduino12/5/2023 ![]() ![]() ![]() The LIN lines are connected to Arduino pins 7, 6 and 5 respectively for phase A, phase B and phase C. The Arduino UNO can generate PWM signals on that pins where only high side mosfets are PWMed. The HIN lines of the three IR2101 are connected to pins 11, 10 and 9 respectively for phase A, phase B and phase C. The figure below shows input and output timing diagram: The IR2101 chips are used to control high side and low side mosfets of each phase. The switching between the high side and the low side is done according to the control lines HIN and LIN. The outputs of the 3 comparators are connected to Arduino pins 2, 3 and 4 respectively for BEMF A, BEMF B and BEMF C.Īrduino UNO pins 2, 3 and 4 are ATmega328P microcontroller external interrupt pins PCINT18, PCINT19 and PCINT20 respectively. The LM339 outputs are open collector which means a pull up resistor is needed for each output, for that I used three 10k ohm resistors. ![]() Comparator 4 is not used and its input terminals should be grounded.Īs known the comparator output is logic 1 if the non-inverting voltage is greater than the inverting voltage and vice versa. BEMF A is connected to the non-inverting pin ( + ) of comparator number 1, BEMF B is connected to the positive terminal of comparator 2 and BEMF C is connected to the positive terminal of comparator 3. The virtual point is connected to the inverting input ( – ) of the three comparators as shown in the circuit diagram above. In this project we need 3 comparators to compare the BEMF of each phase with respect to the virtual natural point because we need to detect the zero crossing of each phase, here I used the LM339 quad comparator chip. The first three 33k (connected to motor phases) and the three 10k resistors are used as voltage dividers, the other three 33k resistors generate the virtual natural point. In the circuit diagram above the 3 phases are named: Phase A, Phase B and Phase C. The following image shows project circuit schematic diagram.Īll grounded terminals are connected together.Īs mentioned above, the brushless dc motor is a 3-phase motor. In this project I’m using the motor shown below, it full name is A2212/13T 1000KV:īrushless dc motor control with Arduino circuit:
0 Comments
Read More
Leave a Reply. |